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https://issues.apache.org/jira/browse/KAFKA-1448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15859803#comment-15859803
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Mileta Cekovic commented on KAFKA-1448:
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Any filtering on server side should be able to understand the message and
should be in a code executable on server side, so it is hard to implement.
Alternative is providing API for publishing additional message attributes
(key-value pairs) alongside the message body, and then the filter could be
simple Boolean algebra expression based on the additional key/value pairs for
message attributes. This would suffice for most use cases.
> Filter-plugins for messages
> ---------------------------
>
> Key: KAFKA-1448
> URL: https://issues.apache.org/jira/browse/KAFKA-1448
> Project: Kafka
> Issue Type: Wish
> Components: consumer
> Reporter: Moritz Möller
> Assignee: Neha Narkhede
>
> Hi,
> we use Kafka to transmit different events that occur on different products,
> and would like to be able to subscribe only to a certain set of events for
> certain products.
> Using one topic for each event * product combination would yield around 2000
> topics, which seems to be not what kafka is designed for.
> What we would need is a way to add a consumer filter plugin to kafka (a
> simple class that can accept or reject a message) and to pass a parameter
> from the consumer to that filter class.
> Is there a better way to do this already, or if not, would you accept a patch
> upstream that adds such a mechanism?
> Thanks,
> Mo
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